It is being reported that in the three months that the Samsung BlackJack has been available in the United States, that 300,000 have been sold so far. You can get a little bit more info on this news here.
That to me sounds like a big number for this type of phone (i.e. Smartphone, PDA, etc.) and it can only be good news. I am sure that Cingular is excited about the response that the BlackJack has received.
I also saw another article that owes some of it's good news to this larger number of BlackJack sales: Surging Demand for Data Services Drive Cingular’s Impressive Gains
Many people purchased their BlackJacks from Cingular along with the data plan so they could take advantage of a phone rebate. You can see how the first and second article are definitely related.